How does our brain understand what we are seeing? Learn about your eyes' lenses, pupils and retinas and how they transmit light to make an image. The diagram shows the key parts of the eye and the blinking dots provide more information.
The Tree story provides short video clips on the growth of trees, how trees adapt to their environment and the impact mankind has on trees. Choose from "the Living Tree", "From Root to Crown" or "The Tree Story".
There are many areas to explore here. In the top menu, you can see three topics: Uses of Water, States of Water and the Water Cycle. For each topic, you can Read, do the Practice activities and then take a quiz.
The Story of Bottled Water describes the environmental and financial impact of using bottled water instead of tap water. This animated documentary is by Annie Leonard and Free Range Studios, the makers of "The Story of Stuff."
In this video, a team of archaeologists and engineers tests a theory of how the ancient peoples of Easter Island moved the massive statues from a cliff-top quarry to the coast and then raised them to an upright position.
Help Twitch collect the parts to repair a robot by using 4 different types of simple machines: an inclined plane, lever, wheel and axle, and pulley. Select the equipment that will require the least amount of force.